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1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2146
PERFORMANCE EVALUATION OF CROSS LAYER SECURITY SYSTEM FOR
SECURE OPTICAL TRANSMISSION
Narmatha J1, I. Muthumani2
1Student, Dept. of ECE, GCE, Tirunelveli, Tamil Nadu, India
2Professor, Dept. of ECE, GCE, Tirunelveli, Tamil Nadu, India
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Abstract - Cross layer security network is used to improve
the security of image transmission over optical fiber and
Image confidentiality is increased by means of this method.
To evaluate the Security performance of cross layer security
network, encoding schemes is performed at the different
network layers. It is difficult for the eavesdropper to
intercept the code as it provide cross layer security for both
physical and datalink layer. The original image is recovered
if user use correct decoder and encryption algorithm. Hence
it achieves higher confidentiality than other network.
Key Words: Image transmission, Security, Encryption,
Confidentiality
1. INTRODUCTION
Fiber optic network is used in many applications for
image transmission. As user information is more sensitive,
it is important to maintain security in image transmission.
Eavesdropper use some of the techniques like differential
detection, Energy detection and Code interception to
eavesdrop the signal. Two level of security is implemented
by means of cross layer security network. Cross layer
security is the combination of both physical layer security
and data layer security. To improve the security,
transmitted data is encrypted at both physical layer and
data layer. To evaluate the Security performance of cross
layer security network AES encryption is used in data
layer and CDMA technique is used in physical layer.
1.1 Physical layer security
To enhance the security of communication channel
physical layer security is important. OCDMA is employed
to enhance physical layer security. Optical code-division
multiple access (O-CDMA) technique has a advantage of
providing large bandwidth of the fiber medium and
flexibility. Hence it achieve high-speed connectivity,
fairness, flexibility, simplified network control and
management, service differentiation, and increased
security.
1.2 Data layer security
Algorithmic cryptography is employed to enhance
data layer security. Algorithmic cryptography is classified
as two types
 Symmetric key cryptography
 Asymmetric key cryptography
The technique used here is symmetric key encryption.
AES encryption technique is employed to enhance the
security at data layer.
2. PROPOSED METHODOLOGY
The block diagram for cross layer security
network is depicted in Fig.1. cross layer security system is
designed with the help of optisystem. optical encoder and
optical decoder is constructed by means of optical delay
lines with the optical orthogonal code. At the transmitter,
user data is encrypted by means of AES encryption, and
then modulated by means of M-Z modulator. The
transmission power is 0 dBm and the central wavelength
is 1550 nm. The transmission rate is 10 Gbit/s. The
modulated signal is encoded by the optical encoder using
optical orthogonal code . Then, the signal is amplified by
an erbium doped fiber amplifier (EDFA) and transmits
through a single mode fiber link. The dispersion
compensation fiber (DCF) is used to compensate for the
fiber dispersion.
Fig-1: Block diagram of Cross layer security network
At the receiver, optical signal is decoded by a matched
decoder for the user. Cross layer security network for
secure optical transmission is designed with the help of
Optisystem simulation software
2.1 Transmitter
The transmitter block designed in Optisystem is
shown in Fig-2. The AES encrypted image is fed as input
to User defined bit sequence generator by enabling load
from file option. The AES encrypted data is then
modulated by means of MZ modulator. The modulated
signal is encoded by optical encoder using optical
orthogonal code {1,13,25,40,53}. The delays introduced to
encode the signal are 3 ps, 18 ps, 33 ps, 51.7 ps, 68 ps,

2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2147
respectively. The signal is then modulated by optical
amplifier and then transmitted via an optical fiber.
Fig -2: Transmitter of cross layer security network
2.2 Receiver
At the receiver, optical signal is decoded by a
matched decoder for the user. The relative delays of the
decoder are 97 ps, 82 ps, 67 ps, 48.3 ps and 32 ps
respectively.
Fig 3: Receiver of cross layer security network
3. RESULTS AND DISCUSSION
3.1 Encryption
The encryption is performed at both physical layer and
data layer of optical network. Fig -4 depicts the original
image transmitted via optical fiber.
Fig -4: Original image
The transmitted image is first AES encrypted to
enhance data layer security. Fig -5 depicts the AES
encrypted image which is load as input to user defined bit
sequence. The AES data is again encrypted by means of
optical delay lines which acts as optical encoder which
enhance the security at physical layer. Fig -6 a depicts the
encrypted image received at the end of receiver.
Fig-5: AES encrypted image
3.2 Decryption
The signal is collected via view signal visualizer and
again decrypted with correct decoder to retrieve the
original image. Fig -6b depicts corresponding decrypted
image
Fig -6 a)Encrypted image b)Decrypted image

3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2148
3. CONCLUSION
Cross layer security network enhance the security
at both physical layer and data layer. The transmitted
image is retrieved at the receiver only user use correct
decryption algorithm and correct decoder that exactly
matches the encryption algorithm and encoder at the
transmitter side. It enhance the security and it is
impossible for the eavesdropper to eavesdrop the signal.
The future scope of this paper to introduce different
encoding schemes to improve the security further.
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